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Radconpro

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Gross Beta DCGL
« on: Aug 17, 2007, 10:24 »
I have been tasked to calculate a Gross Bets DCGL for depleted uranium...my established Gross Alpah DCGL is 1250 dpm/100cm2....can anyone shed some light?

Offline SloGlo

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Re: Gross Beta DCGL
« Reply #1 on: Aug 17, 2007, 01:05 »
wail, da smartaze quickfire response wood be 3750 dpm/100 cm2 betagamma.
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Offline Rennhack

Re: Gross Beta DCGL
« Reply #2 on: Aug 17, 2007, 03:12 »
wail, da smartaze quickfire response wood be 3750 dpm/100 cm2 betagamma.
Yeah, 2.7 (or 3) beta to every anticipated alpha is a good thumb rule.  But then again, it depends on the energy bata you are calibrated for.

alphadude

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Re: Gross Beta DCGL
« Reply #3 on: Aug 21, 2007, 08:38 »
The approach to the determination of site specific DCGLs, based on guidance contained in Preliminary Guidelines for Evaluating Dose Assessment in Support of Decommissioning” (NUREG-1549) is as follows:
   
•   Step 1 – Determine the source inventory
•   Step 2 – Define future land use scenarios
•   Step 3 – Identify exposure pathways
•   Step 4 – Develop conceptual model
•   Step 5 – Determine DCGLs
•   Step 6 – Perform sensitivity analysis

Beware of those quick answers, what scenario are you running? What effects does the local soil and water have on transport mechanisms? (you need to run a resrad determination.) If you are truely going to develop  DCGL criteria- it may take you a while and then getting it justified will take longer. presentation to the stakeholders should be considered.

If you are developing scaling factors for surveys-develop your technical basis with instrument eff. for the energies of concern.  That should only take a few days or week. Publish your technical basis and get it approved. If you are doing thumb rule frisking-(see first two replies) you are not developing a DCGL-you are making an operator aid. At that point each instrument will have a multiplier to compensate for the "number of clicks you hear" before you can release it. Technician review and some training should be provided.

« Last Edit: Aug 21, 2007, 09:24 by alphadude »

Offline Rennhack

Re: Gross Beta DCGL
« Reply #4 on: Aug 21, 2007, 11:19 »
you need to run a resrad determination
And thats that bottom line.

 


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